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The Artist |
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The Artist Super Spammer
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Aff |
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Aff World Chat Champion
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Smudger |
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Smudger L Plate Warrior
Joined: 26 Oct 2014 Karma :
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Posted: 17:04 - 26 Oct 2014 Post subject: |
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First...Hi...new member, joined to check out info on Bandits, came across this posting, a great project and read.
Have also built a leccy bike also, using a Commencal Supreme DH bike,decent spec, full suspension, Hayes Hydraulic brakes and oversize rotors, a Crystalyte HS3540 & 45amp controller conversion.
I am using 40- 5000mah Lithium Polymer cells 20 in series then paralleled giving me 84v off charge at 10amp rating.
Bike is quick, to say the least......
https://www.youtube.com/watch?v=22n-V_M5KYk&index=1&list=UUCHzwaRdllXPskLGm9SBbFw
A short vid...run to the pub on 'ThunderBike'
All the best.
Tony |
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The Artist |
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The Artist Super Spammer
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G The Voice of Reason
Joined: 02 Feb 2002 Karma :
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The Artist |
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The Artist Super Spammer
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G The Voice of Reason
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Sload |
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Sload World Chat Champion
Joined: 28 Aug 2011 Karma :
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Posted: 01:00 - 11 Dec 2014 Post subject: |
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Just read all of that and must admit you lost me a bit with your batteries and your makeshift spot welder , seriously impressed and you're completely nuts ____________________ Honda Varadero >> Triumph Speed Four >> Honda CBR1100xx |
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The Artist |
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The Artist Super Spammer
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Aff |
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Aff World Chat Champion
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The Artist |
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G The Voice of Reason
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Aff |
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Aff World Chat Champion
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The Artist |
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Aff |
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Aff World Chat Champion
Joined: 05 May 2011 Karma :
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Posted: 20:08 - 11 Dec 2014 Post subject: |
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Dont pay much attention to the voltage of the motors, it's just how the Chinese market stuff.
You can run pretty much any motor at any voltage.
The higher wattage ones will just have more copper in them and better heat dissipation.
I have seen the motor I use being sold as a 36V 350W motor, but I have been running it consistently at 3kW and it's fine.
The motor will have a Kv rating which is probably most importantthing you need to know. This will be a value around about 10 and tells you how many RPM the motor will do per Volt. So you can buy a motor around the speed you want to do.
This is important because these direct drive hub motors have a very weird efficiency curve. They usually look something like this:
https://www.johnsonelectric.com/common/en/images/resources-for-engineers/automotive-applications/motion-technology/ec-motor-brushless/performance-curve-01.jpg
So you have a small area around 70-80% of the motor rated speed where it is very efficient, with sharp falls in efficiency around it.
This is why things like pedalling when pulling off and going up hills makes so much difference to your range.
For commuting I would be aiming to make a bike that stays in that range as much as possible.
As for a charger, don't bother with iMax B6's they spac out when trying to charge large batteries.
I would spend the £100 on a decent balance charger.
But you can do it cheaper and faster with meanwells if you dont balance.
Or you could try one of the dodgy Chinese eBike chargers.
Another option would be to add a BMS to you pack. Then all you need to do is give it power and it will sort it for you. I don't trust these though. I have seen them kill packs and bikes. ____________________ Current Bikes:Honda 929RR Fireblade, Honda CD200 Benly (Project), Stomp Z2 140
Electric Bike Project |
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The Artist |
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The Artist Super Spammer
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Posted: 01:20 - 12 Dec 2014 Post subject: |
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The Artist |
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The Artist Super Spammer
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Posted: 20:20 - 16 Dec 2014 Post subject: |
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Hub motor ordered.
I am going to make my own battery pack but this will take time and I want to do that properly and so rather than rush that, I am going to go for a cheap lead acid solution for the time being. After doing much research, I am basically copying what everyone else has done. There are quite a few e-bike homemade jobbies out there doing the same things, even down to the spot welding and magnets for charging and they all seem to work.
For now though...
https://www.batterymasters.co.uk/ProductDocs/SLAUMXNP12-12-TECH.pdf
4 of those in series = 15kg's, realistically looking at maybe 7-8Ah but that should be enough for my commute of ~4 miles each way. I hope they don't mind having 20A pulled through them momentarily although I am thinking of limiting the current to 10A max just so I don't completely ruin my range. So I can get those + a cheap charger for <£100.
OR do I spend £180 on a chinese lithium 48v 12ah pack with BMS?
Which option would be best for short term? |
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G The Voice of Reason
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Aff World Chat Champion
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Old Thread Alert!
The last post was made 9 years, 176 days ago. Instead of replying here, would creating a new thread be more useful? |
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